You can try www.rhok.org or hack4good.io for some open source projects that are meant to help the community/world, you might find something that interest you an

You can try www.rhok.org or hack4good.io for some open source projects that are meant to help the community/world, you might find something that interest you and help while doing it :) If you mention what area interest you (mobile / web / data etc) I might know a couple more projects to recommend